Cushioning device for handles



Nov. 30, 1926. H 1,609,117

C. C. HANSEN CUSHIONING DEVIQE FOR HANDLES Filed August 4. 1926INVENTOR, 770018661 BY v Patented Nov. 3%),

; i mean? rice.

CHARLES C. HANSEN, OF EASTON, PENNSYLVANIA,

T EhTGERSOLL-RAND COMPANY, 035 JERSEY CITY, NERV JERSEY, ACGJZQEOEZVATION OF NEW JERSEY.

OUSHIONING DEVICE FOR HANDLES.

Application filed August 4, 1.926.

This invention relates to crank handles, but more particularly to acushioning device for the grip portion of a crank handle.

Thepresent invention is particularly applicable to rock drills of thetype in which relative longitudinal movement between the drill and itsmounting is obtained by means of a feedscrew adapted to be manuallyrotated by means of a suit-able crank handle, or for other machines inwhich excessive vibration is set up during their operation and in whichit'is necessary for the operator to maintain a constant hold on thehandle.

' The objects of the invention are to cushion the grip portion of thecrank handle in order to'protect the operators hand against injury whichmight otherwise be caused by the excessive vibration of the crankhandle.

Other objects will be in part obvious and in part pointed outhereinafter.

The'invention consists of the combination of elements and features ofconstruction substantially as hereinafter described in the appendedclaims and illustrated in the accompanying drawings, in which Figure 1is an elevation of a crank handle equipped with a cushioning deviceconstructed in accordance with the practice of the invention,

Figure 2 is a transverse sectional. view taken through Figure 1 on theline 22 looking in the direction of the arrows,

Figure 3 is an elevation of aportion of the crank handle equipped with amodified form of cushioning device, and

Figure 4 is a transverse sectional view taken through Figure 3 on theline 4.4L looking in the direction of the arrows.

Referring to the drawings, the invention is shown applied to a crankhandle A. having a bore B for the reception of an end of a feed screw ofa rock drill or other similar element (not shown) to which the crankhandle A may be applied. The crank handle A in this instance is providedwith a lateral grip C having an outer enlarged portion D and a portion Eintermediate the enlarged port-ion D and the arm F of the crank handleA. The intermediate portion E is in this instance of smaller diameterthan the outer portion E as is customary in handles of this type.

Means is provided for absorbing the vibration of the crank handle A whenthe said crank Serial No. 127,161.

crank handle A. is used for the purpose of actuating a feed screw of arock drill or other similar machine in which excessive vibration is setup during the operation of the machine. I To this end a yieldable sleeveG, preferably of rubber, is arranged about the grip C which it encirclesand is preferably of a length to permit its outer end to extend partlybeyond the end of the enlarged portion D of the grip O.

In order to enable the sleeve G to rotate freely on the grip C, aferrule H is inserted in the sleeve Gr and has an enlarged portion Jinclined at its ends as at K and L to engage correspondingly inclinedportions of the grip C for preventing relative longitudinal movementbetween the sleeve G and the grip. A portion O of the ferrule H, ofsmaller diameter than the port-ion J, encircles the reduced portion E ofthe grip G and is preferably of a length to contact with the portion'Eat a point adjacent the arm F. The ferrule H is in this instance split1n half sections P for convenience of assembling same on the grip O andis held in assembled position by the constrictive action of the sleeveG.

In assembling the device, the ferrule sections P may first be placed inposition on the grip C and the sleeve Gr may then be telescoped overthe, sections P. The sections 1? will thus be held securely in positionby the sleeve, since the internal diameter of the sleeve G is preferablyslightly smaller than the diameter of the small portion 0 of the ferruleH.

The present invention has been found to be an eflicient means forprotecting the operator of rock drills and similar machines against theeffects of excessive vibration. Heretofore, considerable discomfort hasat times been caused to the operator of such machines due to bruises andother injuries caused by the vibratory action of the crank handle. Thisis particularly true in the operation of certain types of rock drills inwhich the operator must of necessity maintain a constant grip on thefeed screw crank for feeding the drill steel into the rock. Thisobjectionable feature has been entirely eliminated by the presentinvention and as a result the efficiency of the drill may beconsiderably increased.

In the modification illustrated in Figures 3 and 4, a rubber ferrule orbushing Q is arranged about the reduced portion E of the grip Gland,is-ofia l'engthvtoi: contact with its ends on inclined surfaces R andSof the grip C to hold the bushing Q against endwise movementWithrespect" to the grip.-

as at T to enable it to be quickly arranged about the grip C.

In the present instance, a sleeve U of suit able length isdisposed-about the grip C and is preferably of such diameter that Whenitis in assembled position on the grip C it \vill be somewhat expanded ontheenlarged portionDofthe grip G to assist in preventingrelativelongitudinal movement between the grip and-the sleeve.

Any suitable means may be-pr0vided for holding the sleeve U and thebushingQQin assembledrelationship with respect to each other, in thepresent instance, rivets V are employedjor this purpose and t-heheadsofthese rivets are preferably drawn into the sleeve U to prevent cont-act?thereof with the operatorsyliand.

In assembling the devicedescribedin this modification, the bushing Q1may first be placed about the grip (land the sleeve. U may. then bedisposedabout the saidlb'ushr ing-and-the' grip G, Thereafter the rivetsVinaybedriven through the bushing and the'sleeV-einsuch manner that thepointsof the'rivets wi-11.bespreadon the grip Cf. to

.L bushingyQ' is preferably split on one side prevent accidentalseparation of the Sleeve and the bushing! I' claim:

1'. A cushioning device for a handle, comprising ayieltlablesleeveencircling-the handle, and ineans si-ir-rounded'by thesleeve to engage the handle for preventing endwise movement of thesleeveWith respect to the handle, said means. being detachable from thesleeve.

2.. A, cushioning device for a. handle=havingainenlarged portion;.comprising a .yieldable Sleeve encirclingthe. handle anda ferrulesinterposed between. the. handle. and the sleeve to engage; the enlargedportion for preventing; relative longitudinal. movement between i thehandler and .the sleeve, .said" ferrule beingheldiin engagementlwith.thehandle by. the sleeve.

3. Ai cushioning devicefor a handlehaving an enlarged'portion,comprising a yieldable sleeve eneirclingthe liandle and-a split ferruleinterposed between the handles and the sleeve to engage the enlarged'portionfor preventing relative longitudinal movement between, thehandle and the. sleeve,. said sleeve and said ferrule being freelyrotatable on the handle.

In testimony whereof .1" have signed this specification.

CHARLES GI. HANSEN.

